Achilles

I don't know what exactly does cause it, but I'm fairly certain it's not an issue with the gun models; I've never been able to get mine to look right while being dual wielded.

Though personally I don't think it's a direct issue with the body models either, as I find it hard to believe that each body model's offhand hook was screwed up independently from the other, especially when some of them were in K1 and worked fine. My guess is that it has something to do with the way the engine interprets the second hook's location, if that makes any sense.